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. P. A. GARDNER.

l VALVE GEAR; No. 291,476. 'Patented Jan. 1, 1884.

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j lhvrrnn France Parana @maca FREDERICK A. GARDNER, OF BUFFALO, NEV YORK.

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SPECIFICATION forming part of Letters Patent No. 291,476, dated January 1, 1884.

` Application filed March 30, 1883. (No model.)

To all whom, t may con/cern:

` NER, a subject of the Queen of Great Britain,

residing in Buffalo, in the county of Erie and State of New York, have invented certain new' and useful Improvements in Valve-Gears, of which the following is a specification.

The object of this invention is to provide a simple and efficient means for reversing an engine,whereby the lead of the valve is preserved during every port-ion of the reversing movement, all of which will be fully and clearly `hereinafter shown by reference to the accompanying drawings, in which- Figure 1 is a sectional elevation of the greater portion of the reversing-gear, a part of the reversing apparatus being shown as a side elevation. Fig. 2 is an enlarged front elevation. of the eccentric and casing surrounding it. Fig. 3 is a top view of the device, a portion being -broken away to expose the eccentricreversing mechanism. Fig. 4t is a front view of the case, and Fig. 5 represents a vertical `central section through the case. Fig. 6 is a vertical longitudinal section through the eccentric. Fig. 7 is a vert-ical section through the center of the device upon which the eccentric turns. Fig. 8 represents an end view of the same and a section through the Veccentric `cradle or frame on line X X, Fig. 6, showing that portion of the eccentric in its position on the supporting device upon which it` swings. Fig. 9 is a section through line X X, Fig. r,6, separate from the supporting device. Fig. 10 is a detached side elevation of the reversing bar. Fig. 1l represents an end view of the same. Fig. 12 is a side elevationof the `eccentric and a partial view of the valv'efstem, showing the position of the center for reversing; and Fig. 13 represents a similar view of valve-stem and eccentric, showing the invention applied to an ordinary engine. Y

a is the case for inclosing the eccentric and its connections. It is provided with abearing, a', in the `frame a2, so as to turn easily and smoothly therein. y The ,eccentric consists of the eccentric c3 and theframework at. (See Figs. l, 3, and 6.) The" eccentric a is a hol- :j low grooved eccentric, into which the curved pieces a5 are fitted, so `as to move easily there-` 4 but any other form of eccentric may be used Be it known that I, FREDERICK A. GARD` and connected with a single valve-stem for operating a single engine. The connectingrod or valve-stem is connectedto the curved block c5 by a joint, b, and its opposite end is connected in any well-known way to the valve. The block a5 is fitted in the eccentric or groove a3, so that as the eccentric turns the curved block is made to move the valve-rod back and forth in the direction of its length and operate the valve; but the said block has no other movement, as the valve-rod should be held in guideways either substantially as shown in my Patent No. 226,055,` or in4 any other wellknown way. The eccentric is tted to the holding-piece b, which is fastened to the case a by screws b2, so as to turn easily on the journals b3, arod, b4, being passed through the hole b5 of the supporting-piece b for the purpose, the head bs of the piece bAk being made larger, so as to be retained in place by the parts when put together. The engineshaft c is secured to the part b by a pin, c. The reversing-bar c2 passes in through the center, c6, of the case a, through the end of the eccentricopening c7 and the part c: of the supporting device. Its forward end is provided with a loose friction-roller, c", arranged on a pin, c", and at the opposite end with a collar, c5, and loose collar c3 between the shoulders d, it being arrangedso as to turn easily, but has no movement longitudinally on the shaft; It is provided with pins fl, by which it is fastened to the lever d2, which lever is fastened by a c2 is prevented from turning by means of the 'feather and groove e2 and @,Figs. 8 and 11.

It will now be seen that the eccentric will be made to turn in the direction of the arrow e, drawing the bar c2 backward, and that a forward movement will reverse its action.

@tis the ordinary quadrant, having notches into which the ordinaryreversing-lever catches and holds it when operated for reversing. The positions of the eccentric are shown in Fig. 2,

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in full and dotted lines. It will be noticed that the case c and the whole reversing-gear turns while the engine is in operation. The hole i or segmental slot through the fore part of the eccentric is made sufficiently wide to allow for its movement from side to side in reversing the engine. The method of nding the center upon which the eccentric turns and its applicability to either kind of engines may be seen by reference to Figs. 12 and 13. The eccentric shaft or stem f2 is fastened to the eccentric in any well-known Wayin each case, Figs. 12, 13, and opposite that center or on the other side is the center upon which it turns. The turning-point is always at the edge of a coinmon eccentric and in a grocved eccentric in the center of the groove, as shown in Fig. 12. The dotted lines show its position one way, g, for running theengine in one direction, and an opposite direction, g@ for reversing it. It is shown on the drawings in the position for moving it on the dead-center; but of course it can be moved from any other point as readily, but from the point shown it would not move the eccentric-rod or valvestein, as will be readily understood by reference to the drawings and foregoing description.

The curved pieces @their construction,their object, and connection with the valve is fully shown and described in my Patent No. 226,- 055, dated March 26, 1880; therefore a further description is not required here. rllhe curved slot through the eccentric, and through which the shaft passes, and which allows it to be moved freely from side to side, should not be placed in the center of the eccentric, but at a point nearest or toward the center of the `journal b3, (see Fig. 18,) in which the position of the slot through which the shaft passes is shown. The object of this is to preserve the lead of the valve at any point the eccentric may be adjusted, to one side-or the other.

I claim- 1. rllhe case a, the frame a2, and frame c3 a, provided with the diagonal slot e', the reversing-arm c2 and its reversing-roller, and the reversing-gear, substantially as specified, in combination with the supporting device Z and the joints upon which it swings, for the purposes described.

2. The casing c, jointed to the frame a2, and the device b, secured with the casin g, in combination with the eccentric jointed thereto and provided with a diagonal slot and with a reversing bar and lever, substantially as described.

3. `The arind2 and reversing-bar c?, provided with a roller, ci, arranged within a diagonal slot,- in combination with the eccentric, set on journals in the part b, substantially as and for the purposes described..

4. A pivoted eccentric for engines, having the curved slot, through which the shaft c passes, placed to one side or slightly 'out of the center, or at a point between the center of the eccentric and the center of the journal b3, or nearer the periphery at the point upon which it turns, and having the pivot b"i arranged at a point on a line with the periphery of the eccentric, so that the eccentric may be moved from one position forreversingthe direction of movement to the other without moving the valve-rod while the engine is on the dead-center, the crank being on the same side, whereby thelead of the valve is kept in its proper position at all times, substantially as specied.

FREDERICK A. GARDNER.

lVitnesses:

J. M. CALDWELL, JiiMns SANcsrnR. 

